[jQuery] refresh a DIV

I have a DIV with a php query in it. i'd like to get pointers to maybe 2 solutions. Ideal situation: I have a other jquery script that launches an onComplete like: 'onComplete': { } basicly i want to let it do a refresh on #My sql query# other situation I want to refresh this DIV every 5 s

[jQuery] Refresh a Div in a page (via a button)

Hello, I'm looking for a code/script which allows the user to refresh (via a button) a specific Div inside a Web page, without refresh the full page. Do you have any idea how to do that? Thanks a lot for your help :) Chris